Telephone system.



S. A. BEYLAND & H. L. HARRIS.

TELEPHONE SYSTEM.

APPLICATION FILED 05c. 20. 1912.

Patented May 16, 1916.

THE COLUMBIA PLANGGRAPH co.. WASHINGTON. I: c.

UNITED STATES PATENT OFFICE.

SIDNEY A. BEYLAND, OF NORTH RIDGEVIIiLE, AND HARVEY L. HARRIS, OF ELYRIA, OHIO, ASSIGNORS TO THE GARFORD MANUFACTURING COMPANY, OF ELYRIA, OHIO,

A CORPORATION OF OHIO.

TELEPHONE I SYSTEM.

Specification of Letters Patent.

PatentedMay 16, 1916.

Application filed December 20, 1912. Serial No. 737,789.

To all whom it may concern Be it known that we, SIDNEY A. BEYLAND, a citizen of the United States, residing at North Ridgeville, Ohio, and HARVEY L. HARRIS, a citizen of the United States, residing at Elyria, Ohio, have invented certain new and useful Improvements in Telephone Systems; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to telephone systems, and more particularly to common battery systems and what are known as trunking systems.

Although our invention is adapted for other uses, we find it has especial advantages when used with private branch exchange circuits. V

One of the objects of our invention is to provide means for locking up the trunk circuit as soon as the private'branch exchange operator answers. \Ve aim to do this automatically when the private branch exchange operator connects her telephone set to the trunk.

Another object of our invention is the releasing of the locking device as soon as the desired subscriber answers, and further, to do this automatically. We also aim to provide means for releasing the locking device by means of the ringing key in case the called subscriber fails to answer.

Another object of our invention is to control all or substantially all of the operations of the trunk by the listening and ringing keys. 3

Another object of our invention'is to provide means for actuating the ringing signal only during ringing and the disconnecting signal only after the subscriber answers and for holding these signals silent during the other operation.

Another object of our invention is to provide means for preventing the operation of the guard lamp during outgoing calls, that is, calls from the private branch exchange to the main exchange.

Other objects of our invention and the invention itself will be best understood from a reference to the particular description.

Figure 1 diagrammatically illustrates a circuit embodying our invention. Fig. 2 is invention.

a detail showing certain mechanical features of the relays R and S.

Referring now to the drawings, at A is shown the central station or the position of We have here illustrated the A operator. a cord circuit which may be of any suitable form. The sides of thecord are shown at l and 2, having condensers 3 and 4: interposed therein. The sides or strands of the cord terminate in plugs 5 and 6. At B is shown a battery connected to the sides of the cord throughsupervisory relays controlling tacts, here numbered 13 and 14: for the' answering plug 5, and 15 and 16 for the' calling plug 6.

At B we show certainof the apparatus of the trunk line which is generally installed at the private branch exchange board or at the B position. The trunk extends between the station A and the stationB. The sides of the trunk are numbered 17 and 18, terminat ing in a suitable manner at the A board in ajack J, the side 17 terminating in a tip spring 19 and the side 18, in a sleeve spring 20. There is also shown a ring 21 as one of the elements of the j ack, connected through a cut-off relay V by-a conductor 22 to ground. The line lamp is shown at L and the line relay at W. These elements, however, do not constitute any part of our In fact, any suitable form of line relay and signal may be employed.

A relay R is shown connected to the trunk and controlling a signal L The circuit of the relay R is controlled by a second relay S.

At K we show the listening springs of the listening key of the B operator.

T and U are relays whose functions will be described'in the operation of the system.

At K, we show the ringing key of the B operator and P, the plug at the B end of the trunk.

A subscribers line is illustratedat-F, a receiver F receiver hook Hand transmitter H being connected in thecircuit of the subscriber.

Referring now to Fig.2, it"will be seen that the relay S controls a restoration of the drop controlled by the relay R, and that the switch 4:546 will be closed when R is energized and opened again when S is energized, since S will attract the member 50.

The invention and the embodiment of the invention will probably be better understood from a description of the operation, which is as follows: Assuming that asubscriber, whose line terminates at the exchange A, desires to converse with the subscriber at C upon the substation line F, which terminates at the B exchange, this subscriber will signal the operator A in the usual manner and the operator A will insert her answering plug into the jack (not shown) of the called subscriber. Having learned that-he desires to communicate with the sub scriber at C, the calling plug 6 is inserted into the jack J, whereupon the cut-off relay V will be energized over 22 the sleeve 16 conductor 2* relay 11 to battery B and ground, the circuit being completed through ground to the grounded terminal of the relay V. Thus energized, the relay V attracts its armatures 2A and 25, interrupting the connection of the cut-0E relay to the line. The operator at A then connects her ringing generator 23, placing ringing current upon the trunk through the following circuit :ground G2326-715- 191727 relay B- condenser 28i1 50l820 sleeve 16150-151- B,, to ground at G The magnet B will be energized, attracting its armature 29 and releasing the drop 50 from the catch 30. The drop 50 will fall backward, connecting the contacts 45 and 46 and completing a circuit through the lamp L as follows :ground G,50454:6L,31B, to ground at G This lamp will burn before the B operator and indicate to her that a connection is desired by the A operator. The B operator then operates her listening key K, which forces thesprings 60 and 61 to engage the contacts 62 and 63, which are connected by conductors 6A and 65to a telephone set used by the B operator. This places the B operator in connection with the trunk, so that she can converse with the A operator, whose telephone is connected to the conductors 66 and 67. In addition, the listening key will close the contacts 68 and 69 when it is thus operated, closing a circuit from ground at G,- conductor 70 contacts 69 and 68 conductor 7l relay T and the lamp L in parallelthecondnctor 72 battery B to ground at G The relay T will be energized, attracting its armatures 7% and 75, closing a switch 7 l7 6 and connecting a bridge 7 7 through this switch and a winding 3, of the relay S across the trunk, thus locking up the trunk. This bridge performs all of the functions of a subscribers circuit, so far as the signaling at the central station is concerned, and will serve to maintain the proper signaling there even after the B operator has taken her set off of the trunk. The armature 75 is attracted, closing a switch 7 5-78 and completing a locking circuit for the relay T over the conductor 7 9-- through the switch 81 the conductor 82' and the switch 83-84 controlled by the key K hen the winding 8, was connected across the trunk, a circuit was completed therethrough from the battery B over the two sides of the cord and trunk. The relay S was thus energized, attracting the member 50, (see Fig. 2) breaking the bridge 27 and the circuit of the relay R at lk-42, opening the switch 4546 and restoring the member 50 to its normal position under the catch 30, thus breaking the circuit of the lamp L Having learned that it is the subscriber at C that is desired by the A operator, the B operator inserts the plug P into the jack J The relay S is then locked up over a circuit from G B 31s-85 the sleeve contact 86 of the plug P- 87 to ground at G,. A substitute locking circuit for the rela Y T is also provided as follows: G -B,72 7875-79808188-89909185 8687 to ground at G The ringing key K, is then operated to signal the subscriber at C. During this period, the lamp L will be illuminated, indicating to the B operator that the subscriber at C has not responded. hen the subscriber at C responds, the hook switch 8 rises and engages the contact 92, completing the subscribers circuit and a circuit through the relay U through both sides of the cord at the station A, both sides of the trunk and the line of the subscriber C. The relay U will attract its armature 81, interrupting the circuit of the relay T and the lamp L at S081, denergizing both of these elements, so that the ringing lamp will be extinguished, indicating to the B operator the response of the subscriber at C. The deenergization of the relay T will interrupt the bridge 77, which is no longer needed, since the bridge created by the response of the subscriber at 0 now performs the functions performed by the bridge 77. WVith the apparatus in this condition, the conversation is carried on, and at the termination thereof, the party at C will hang up the receiver, thus interrupting the bridge created at that sub-station. hen G hangs up the relay U will be deenergized, so that the armature 81 will fall (back upon the contact 80, creating .a circuit through the disconnect lamp L, as

follows G,,B,72100L,4i43 101 10275798081' 8283 8L to ground at G The operation of this lamp will indicate to the B operator that the conversation is completed, whereupon the plug P is withdrawn from the jack J. This will interrupt the circuit of the winding 8 of the relay S, which will let go of the contact 43, interrupting the circuit of the disconnect lamp at 4344, restoring the apparatus to normal. Should the subscriber at C never respond, the circuits of the relay T and the lamp L may be interrupted and the system restored to normal by Withdrawing the plug P and operating the key K since the withdrawal of the plug restores the control of the relay T and the lamp L through the conductor 82 and the switch 8384E controlled by the ringing key K Assuming that the subscriber at C desired to converse with a subscriber whose line terminated at the A board, the receiver F, at C is removed from the hook H, which closes a switch H-92 and completes a circuit through a suitable signaling device arranged adj acent the jack J, at the B position. Observing this signal, the B operator will insert the plug of an ordinary cord into the jack J to learn the wants of the subscriber at C. Having learned that he desires a subscriber whose line terminates at the A board, the plug of the ordinary cord is Withdrawn and the plug P of the trunk inserted, completing the connection of the subscriber at C as far as the A board. The relay V will be operated over the line of the subscriber at C and the trunk, as follows: BVV2518 ring of P ring spring of J tip of P1724 to ground. The relay draws up its armature 104: and completes the circuit of the lamp L. hen the plug P was inserted into the jack J the winding 8 of the relay S interrupted the bridge 27 of the relay R. The A operator observing the lamp L, will insert an answering plug into the jack J, and having learned the desire of the subscriber at C, will place the subscriber at C in communication with the called party. During the conversation period none of the lamps at the B position will be operated. hen this period is terminated by the restoration of the receiver F to the hook H, the circuit through the line F is interrupted, deenergizing the magnet U, which releases its armature 81, which falls back and closes the switch 8081 and completes a circuit through the lamp L as follows: G B -72100L ,4A43 101 102 -7579SO-S18283SL to ground at G,. This will cause the illumination of the lamp L and indicate to the B op erator that the conversation period is completed and that a disconnection is in order. The plug P is then withdrawn from the jack J whereupon the apparatus is restored to normal.

Assuming that the subscriber at C should desire a recall previous to the time that the plug P is withdrawn from the jack J,, the subscriber at C would vibrate the hook H, flashing the lamps L, and either L or L, depending upon whether or not the plug of the cord had been withdrawn'from the jack J Should this recall be answered by the B operator, the operation of her listening key will close a circuit through the relay T as follows :G,--69-6871 T and L in parallel 72B to ground at G,, lighting the lamp L and energizing the relay T. The relay T will close the bridge 7 7 across the trunk preventing further operation of the lamps at the A board due to the subscriber, but the locking circuits of the relay T will not be completed, since the relay U will be energized, opening the switch 80-'81.

It Will be apparent that any suitable form of signals may be used where We haveillustrated and described the use of lamps. Any suitable substation apparatus may be used and any suitable form of plugs and jacks, relays, etc. In fact, numerous and extensive departures may be made from the embodiment of our invention illustrated Without departing from the spirit of the invention.

1. In a telephone system, the combination of a plurality of telephone lines, a main central station} a sub-central station, a trunk circuit for connecting said central and subcentral stations, means for locking up the trunk at the sub-central station, a source of calling current at the sub-central station, and apparatus for connecting such source to one of said telephone lines, said apparatus controlling the means'for locking up the trunk.

2. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk for connecting said central and sub-central stations, mechanism for locking up the trunk circuit, and a ringing key at the sub-central station controlling said locking mechanism.

3. In a telephone system, the combination of'a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, mechanism for locking up the trunk at the sub-central station, a ringing key at the sub-central station and means controlled by said ringing key for disabling said mechanism.

4. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, mechanism for locking up the trunk at the sub-central station, a lis' tening key at the sub-central station controlling said mechanism and a ringing key at the sub-central station controlling said mechanism.

5. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and said sub-central stations, mechanism for locking up the trunk at the sub-central station, a listening key and means controlled by said listening key for operating said mechanism, and a ringing key for controlling said mechanism.

6. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, mechanism for locking up the trunk at the sub-central station, a listening key and means controlled by said listening key for operatin said mechanism, a ringing key and means controlled by said ringing key for disabling said mechanism.

7. In a telephone system, the combination of a plurality of telephone lines, circuit connections for connecting said lines together, a listening key and a ringing key for said circuit connections and a line lamp controlled by said listening and ringing keys.

8. In a telephone system, the combination of a plurality of telephone lines, link conductors for connecting said lines together, a line signal, a circuit therefor, a listening key controlling said circuit and a ringing key controlling said circuit.

9. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, a line lamp in the trunk, a circuit therefor, means controlling the circuit of the line lamp, a listening key controlling said means and a ringing key controlling said means.

10. In a telephone system, the combination of a plurality of telephone lines, a link conductor for connecting the same, a disconnect signal, a listening key controlling said disconnect signal and a ringing key controlling said disconnect signal.

11. In a telephone system, the combination of a plurality of telephone lines, link conductors for connecting said lines together, a listening key and a ringing key operating in connection with said link conductors and a signal under the joint control of said listening and ringing keys.

12. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit connecting. said main and sub-central stations, a signal operating in connection with said trunk circuit, a listening and a ringing key operating in connection with said trunk circuit, and jointly controlling said signal.

13. In a telephone system, the combination of a plurality of telephone lines, a main central station, asub-central station, a trunk circuit connecting said central stations, a disconnectsignal, a circuit therefor, a ringing key controlling said circuit and a listening key controlling said circuit.

14. In a telephone system, the combination of a plurality of telephone lines, link conductors for connecting said lines, a ring ing lamp operating in connection with said link conductors, a listening key controlling said lamp and a ringing key controlling said lamp.

15. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit connecting said central stations, a ringing signal, a circuit therefor, a listening key controlling said circuit and a ringing key controlling said circuit.

16. In a telephone system, the combination of'a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit connecting said main and sub-central stations, a listening and a ringing key operating in connection with said trunk circuit, a ringing lamp and a circuit therefor including contacts controlled by the listening key.

17 In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit connecting said stations, a line lamp in said trunk, a disconnect lamp in said trunk, a ringing lamp in said trunk and ringing and listening keys in said trunk, each of said lamps being controlled by both of said keys.

18. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said stations together, a disconnect signal for said trunk, a circuit for said signal including a source of current, means for automatically interrupting the circuit of said disconnect signal While the trunking connections are being made, and a device for interrupting said circuit during the conversation period, said device acting to permit the closing of said circuit and the operation of said lamp when the conversation period is terminated.

19. In a telephone system, the combination of a pluralityof telephone lines, a main central station, a sub-central station, a trunk circuit connecting said central stations, a disconnect lamp for said trunk, a circuit for said lamp including a source of current, a relay for interrupting the circuit of said lamp when the trunk connections are being made and a second relay for interrupting the circuit of said lamp during the conver sation period, said relay being deenergized at the termination of the conversation period, and contacts of said relay for clostogether, a signal operating in'connection with said trunk, a signal controlling relay controlling said signal and connected to said trunk, a second relay, interconnected arma tures for said relays, a locking Winding on said second relay and a third relay controlling said locking circuit.

21. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit connecting said central stations, a signal operating in connection With said trunk, a relay controlling said signal, a second relay, mechanical connected armatures for said relays, a locking winding for said second relay, a listening key controlling said locking winding and a ringing key controlling said locking Winding.

In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, a listening key in said trunk, a ringing key in said trunk, a plug and jack connection for connecting the trunk and called line, and a bridge for locking up the trunk While connections are being made controlled by said listening and ringing keys and said plug and jack.

23. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, a ringing key in the trunk, one of said lines being a called line, and subscribers sub-station apparatus upon the called line and a bridge for locking up the trunk circuit while the connections are being made controlled by the ringing key and by the called subscribers sub-station apparatus.

24. In a telephone system, the combination of a plurality of telephone lines, link conductors for connecting the same, a listening key for said circuit connections, a ringing key for said circuit connections, one of said lines being a called subscribers line, and called subscribers sub-station apparatus on said called line, mechanism for connecting said link conductors to said called line and means for locking up the link conductors during the connection controlled by said listening key, said ringing key, said mechanism and said sub-station apparatus.

25. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, a listening key in said trunk circuit, mechanism for connecting said trunk to a called'line and a disconnect lamp associated With said trunk circuit controlled by said listening key and said mechanism.

26. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk 27. In a telephone system, the combina- I tion of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, calling apparatus and means including a ringing key for connecting said calling apparatus to a portion of the trunk circuit, one of said telephone lines being a called line, telephone apparatus at the called line and a disconnect lamp associated with the trunk controlled by said ringing key and by said called station telephone apparatus.

28. In a telephone system, the combination of a plurality of telephone lines, a main central station, a sub-central station, a trunk circuit for connecting said central and subcentral stations, an operators set, means including a ringing key for connecting said operators set to said trunk, one of said telephone lines being a called line, telephone sub-station apparatus on the called line, mechanism for connecting the trunk to the called line and a disconnect lamp associated With said trunk circuit controlled by said. listening key, said sub-station telephone apparatus and said mechanism.

29. In a telephone system, the combina tion of a plurality of telephone lines, link conductors for connecting said lines together, an operators set and means including a listening key for connecting said operators set to said link conductors, a source of calling current and means including a ringing key for connecting said source to said link conductors, one of said lines being a called line, subscribers telephone apparatus on said called line, mechanism for connecting said link conductors to said called line and a disconnect lampassociated With said link conductors controlled by said listening and ringing keys, said called line telephone apparatus and said mechanism.

30. In a telephone system, the combination of a plurality of telephone lines, including a called line, link conductors for connecting the same together, an operators set and means including a listening key for connecting said operators set to said link conductors, a source of calling current and means including a ringing key for connecting said source to said link conductors, subscribers telephone apparatus upon the called line, mechanism for connecting the link conductors to the called line and a guard lamp associated with said link conductors controlled by said listening key, said ringing key, said mechanism and said telephone apparatus of the called subscriber. 31. In a telephone system, the combination of a plurality of telephone lines including a called subscribers line, a main central station, a sub-central station, a trunk circuit for connecting said central and sub-central stations, an operators set and means including a listening key for connecting the operators sub-station set to the trunk, substation telephone apparatus upon the called line, mechanism for connecting the trunk circuit to the called line and a guard lamp controlled by said listening key, said called line substation apparatus and said mechanism.

32. In a telephone system, the combination of a plurality of telephone lines, including a called line, a main central station, a sub-central station, a trunk circuit for connecting said central and sub-central stations, a source of calling current and means including a ringing key for connecting said source to said trunk, sub-station apparatus upon the called line and a guard lamp controlled by said ringing key, and said substation apparatus.

33. In a telephone system, the combination of a plurality of telephone lines including a called line, apparatus for connecting said lines together, an operators-set and means for connecting it to said apparatus, a source of current and devices for connecting said source to said apparatus, a substation set on the called line, mechanism for connecting said apparatus to said called line and a signal controlled by said means, said devices, said mechanism and said called line substation set.

34. In a telephone system, the combination of a plurality of telephone lines, apparatus for connecting said lines together, for conversational purposes, a source of ringing current and means for connecting said source to said apparatus, mechanism for connecting said apparatus to one of said lines, a substation set on said line, and a device for locking up the said apparatus when the connections are being made governed by said means, said mechanism and said substation set.

In testimony whereof, We have afiixed our signatures in the presence of two Witnesses this 13th day of Dec., 1912.

SIDNEY A. BEYLAND. HARVEY L. HARRIS. lVitnesses FRANK N. SLOUGH, F. O. RIoHnY.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

